Not anymore lately. There are a ton of pre-announcements under Cook (Airpower, Mac Pro announced years in advance, but also most of iOS 10 and 11 were announced 6-8 months before it made it - e.g. wireless fast charging). This whole odd services keynote had really nothing to launch besides their "News" (i.e. it's only magazines) product. The rest is coming 6+ months later

Apple has a history with the entertainment industry. They know that their cooperation means leaks. We already knew about the updated Apple news, there were rumors about the game subscription thing. We knew something was coming for a TV service because they’ve been buying content.

Basically they might as well have announced things because they were rumors about all of it and if they kept trying to keep it secret for months and months the chances are their partners would end up leaking it purposefully/by mistake.